The Red Orchestra SDK (also known as RO Editor/ROEd/UnrealEd) is a utility used for creating levels, meshes, static meshes, and various other elements of the game. In addition, it decompiles the Red Orchestra code packages.

To install the Red Orchestra SDK, go to your Steam Library window and click Tools.

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Then double-click on Red Orchestra SDK Beta to install it.

Configuring the SDK

By default, this program allows you to modify Red Orchestra. To set up your SDK to modify Darkest Hour instead,

  1. Right-Click RedOrchestra SDK Beta on your Steam Games window under Tools and select Properties
  2. Click the Set launch options… button on the new window
  3. Type the following in the text line and press OK:

-mod="darkesthour"

After this is done, you will be able to run this tool configured for Darkest Hour. If you would like confirmation of the change, browse the drop down text box in the Textures window after the program starts up and you will see terms like DH and British, etc.